Expectations: Understand the importance of heat in our lives

1. Expectations: • Understand the importance of heat in our lives • Understand the difference in the phases of Matter • Understand the difference between physical and chemical changes that occur • Understand the concept of mass, matter and energy

2. What’s the matter?

3. Matter • Matter is anything that has mass and takes up space (Almost everything) • Examples: • You • Your clothes • Your lunch • Air • Water

4. Can you think of some things that are NOT matter?

5. Phases of Matter • All matter is present in one of the following phases: • Solid • Liquid • Gas

6. SOLID A solid is matter that has definite size and shape. Example: Put a sneaker in a box. It stays the same.

7. LIQUID A liquid takes the shape of any container. The particles in water are not as strongly attached as the particles in solids Example: Pour juice into a glass. The juice will take on the shape of the glass.

8. Gases - Gas is matter that has no definite shape. Gases take the shape of whatever container they are in. Particles in gases are loosely attached to each other, or not attached at all Example: The air all around us is a gas.

12. PHYSICAL CHANGES in Matter Changes in the structure or physical appearance of an object

13. Chemical changes in matter cause “New- Matter” to be formed Chemical changes in matter can be made by doing the following: • Burning : example: mollasses • Rusting • Cooking

14. CHEMICAL CHANGES

15. Let’s watch a video clip about matter! States of Matter Click to go to the next slide.

16. Is this a solid, a liquid, or a gas?Can you find more than one type of matter in any of the pictures?

17. Boiling Point The boiling point of a compound, solution, or element is defined as the temperature in which it moves from the liquid state to the gaseous state. The Boiling point is different for various substances

18. Examples of Boiling Points

19. Freezing Point The freezing point of a substance is the temperature below which a liquid turns into a solid.

20. Some examples of Freezing points

21. Energy Transformation • Energy is changed from one form to another: • Example: Potential Energy Kinetic energy  Sound Energy • Toaster converts electrical energy to heat energy and light energy

22. Review: • Is fire Matter?

23. Answer • Yes....Fire is Matter because it has mass, and takes up space. • Fire is the reaction of different gases with oxygen • example • CH4 + 2 O2 → CO2 + 2 H2O + energy

24. Energy Transfer • Energy is transferred from one area to another • Example: Heat from an iron may be felt a foot away • Heat from your furnace may get transferred throughout your house

25. Methods of Heat Transmission (Heat Transfer) Conduction Convection Radiation

26. Heat Conduction In solids, where the particles are closely packed together, thermal energy can be transferred from one particle to another very easily Example: Touch a hot pan, your hand gets burned

27. Convection Thermal energy can be transferred by fluids in a third way, by the circular motion of the particles, called convection. In convection, the warmer particles transfer their energy to the cooler particles as they move in a circular pattern, called a convection current.

28. Radiation Energy

29. Radiation

30. Radiation Energy

31. Social and Environmental Benefits of reducing heat loss/Heat Transfer Insulated clothing: protect our bodies and increases our ability to enjoy outdoor activities in winter. What science and technology concepts are at work in coats designed for use in cold weather? Who might be interested in such designs?

32. Social and Environmental Benefits of reducing heat loss/Heat Transfer

33. Social and Environmental Benefits of reducing heat loss/Heat Transfer What is a green roof? What is the advantage of having a green roof?

34. Social and Environmental Benefits of reducing heat loss/Heat Transfer • Green roofssave on heating and cooling costs and reduce the amount of insulation that is needed. Butthey have not gained wide acceptance in Ontario. • What might be some deterrents to having agreen roof? How might these deterrents beovercome?

35. Social and Environmental Benefits of reducing heat loss/Heat Transfer A well insulated home is more comfortable and costs less to heat. Reducing heat loss saves energy, and saving energy reduces the environmental impact of energy production. What are some areas of your home where heat might be lost? How can this heat loss be counteracted? What are the benefits of doing so?

36. Social and Environmental Benefits of reducing heat loss/Heat Transfer • Energy-efficient buildings areextremely airtight compared to conventionallyconstructed buildings. This minimizes theamount of warm (or cool) air that can passthrough the structure. • What are some of thedisadvantages to having airtight buildings(e.g., lack of fresh air, moisture buildup)? Howcan these problems be solved (e.g., throughmechanical ventilation systems with heatrecovery and humidity control), and howeffective are the solutions?

37. Task # 1 create a product (e.g., a model of a piece of winter clothing, a model of a wet suit, a model travel mug for a hot beverage or food item) that will minimize heat loss

38. Quiz #2: Topics Heat transfer: Convection, Conduction, Radiation Benefits of reducing heat loss Green roofs Insulators vs conductors, Energy Efficiency

39. Mixtures